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README.md

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+---
+library_name: transformers
+tags: []
+---
+
+# Model Card for Model ID
+
+<!-- Provide a quick summary of what the model is/does. -->
+
+
+
+## Model Details
+
+### Model Description
+
+<!-- Provide a longer summary of what this model is. -->
+
+This is the model card of a 🤗 transformers model that has been pushed on the Hub. This model card has been automatically generated.
+
+- **Developed by:** [More Information Needed]
+- **Funded by [optional]:** [More Information Needed]
+- **Shared by [optional]:** [More Information Needed]
+- **Model type:** [More Information Needed]
+- **Language(s) (NLP):** [More Information Needed]
+- **License:** [More Information Needed]
+- **Finetuned from model [optional]:** [More Information Needed]
+
+### Model Sources [optional]
+
+<!-- Provide the basic links for the model. -->
+
+- **Repository:** [More Information Needed]
+- **Paper [optional]:** [More Information Needed]
+- **Demo [optional]:** [More Information Needed]
+
+## Uses
+
+<!-- Address questions around how the model is intended to be used, including the foreseeable users of the model and those affected by the model. -->
+
+### Direct Use
+
+<!-- This section is for the model use without fine-tuning or plugging into a larger ecosystem/app. -->
+
+[More Information Needed]
+
+### Downstream Use [optional]
+
+<!-- This section is for the model use when fine-tuned for a task, or when plugged into a larger ecosystem/app -->
+
+[More Information Needed]
+
+### Out-of-Scope Use
+
+<!-- This section addresses misuse, malicious use, and uses that the model will not work well for. -->
+
+[More Information Needed]
+
+## Bias, Risks, and Limitations
+
+<!-- This section is meant to convey both technical and sociotechnical limitations. -->
+
+[More Information Needed]
+
+### Recommendations
+
+<!-- This section is meant to convey recommendations with respect to the bias, risk, and technical limitations. -->
+
+Users (both direct and downstream) should be made aware of the risks, biases and limitations of the model. More information needed for further recommendations.
+
+## How to Get Started with the Model
+
+Use the code below to get started with the model.
+
+[More Information Needed]
+
+## Training Details
+
+### Training Data
+
+<!-- This should link to a Dataset Card, perhaps with a short stub of information on what the training data is all about as well as documentation related to data pre-processing or additional filtering. -->
+
+[More Information Needed]
+
+### Training Procedure
+
+<!-- This relates heavily to the Technical Specifications. Content here should link to that section when it is relevant to the training procedure. -->
+
+#### Preprocessing [optional]
+
+[More Information Needed]
+
+
+#### Training Hyperparameters
+
+- **Training regime:** [More Information Needed] <!--fp32, fp16 mixed precision, bf16 mixed precision, bf16 non-mixed precision, fp16 non-mixed precision, fp8 mixed precision -->
+
+#### Speeds, Sizes, Times [optional]
+
+<!-- This section provides information about throughput, start/end time, checkpoint size if relevant, etc. -->
+
+[More Information Needed]
+
+## Evaluation
+
+<!-- This section describes the evaluation protocols and provides the results. -->
+
+### Testing Data, Factors & Metrics
+
+#### Testing Data
+
+<!-- This should link to a Dataset Card if possible. -->
+
+[More Information Needed]
+
+#### Factors
+
+<!-- These are the things the evaluation is disaggregating by, e.g., subpopulations or domains. -->
+
+[More Information Needed]
+
+#### Metrics
+
+<!-- These are the evaluation metrics being used, ideally with a description of why. -->
+
+[More Information Needed]
+
+### Results
+
+[More Information Needed]
+
+#### Summary
+
+
+
+## Model Examination [optional]
+
+<!-- Relevant interpretability work for the model goes here -->
+
+[More Information Needed]
+
+## Environmental Impact
+
+<!-- Total emissions (in grams of CO2eq) and additional considerations, such as electricity usage, go here. Edit the suggested text below accordingly -->
+
+Carbon emissions can be estimated using the [Machine Learning Impact calculator](https://mlco2.github.io/impact#compute) presented in [Lacoste et al. (2019)](https://arxiv.org/abs/1910.09700).
+
+- **Hardware Type:** [More Information Needed]
+- **Hours used:** [More Information Needed]
+- **Cloud Provider:** [More Information Needed]
+- **Compute Region:** [More Information Needed]
+- **Carbon Emitted:** [More Information Needed]
+
+## Technical Specifications [optional]
+
+### Model Architecture and Objective
+
+[More Information Needed]
+
+### Compute Infrastructure
+
+[More Information Needed]
+
+#### Hardware
+
+[More Information Needed]
+
+#### Software
+
+[More Information Needed]
+
+## Citation [optional]
+
+<!-- If there is a paper or blog post introducing the model, the APA and Bibtex information for that should go in this section. -->
+
+**BibTeX:**
+
+[More Information Needed]
+
+**APA:**
+
+[More Information Needed]
+
+## Glossary [optional]
+
+<!-- If relevant, include terms and calculations in this section that can help readers understand the model or model card. -->
+
+[More Information Needed]
+
+## More Information [optional]
+
+[More Information Needed]
+
+## Model Card Authors [optional]
+
+[More Information Needed]
+
+## Model Card Contact
+
+[More Information Needed]

config.json

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+{
+  "architectures": [
+    "DaViTModel"
+  ],
+  "auto_map": {
+    "AutoConfig": "configuration_davit.DaViTConfig",
+    "AutoModel": "modeling_davit.DaViTModel"
+  },
+  "conv_at_attn": true,
+  "conv_at_ffn": true,
+  "depths": [
+    1,
+    1,
+    9,
+    1
+  ],
+  "drop_path_rate": 0.1,
+  "embed_dims": [
+    256,
+    512,
+    1024,
+    2048
+  ],
+  "enable_checkpoint": false,
+  "in_chans": 3,
+  "mlp_ratio": 4.0,
+  "model_type": "davit",
+  "norm_layer": "layer_norm",
+  "num_groups": [
+    8,
+    16,
+    32,
+    64
+  ],
+  "num_heads": [
+    8,
+    16,
+    32,
+    64
+  ],
+  "patch_padding": [
+    3,
+    1,
+    1,
+    1
+  ],
+  "patch_prenorm": [
+    false,
+    true,
+    true,
+    true
+  ],
+  "patch_size": [
+    7,
+    3,
+    3,
+    3
+  ],
+  "patch_stride": [
+    4,
+    2,
+    2,
+    2
+  ],
+  "projection_dim": 1024,
+  "qkv_bias": true,
+  "torch_dtype": "float16",
+  "transformers_version": "4.43.3",
+  "window_size": 12
+}

configuration_davit.py

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+from transformers import PretrainedConfig
+
+
+# Define configuration class
+class DaViTConfig(PretrainedConfig):
+    model_type = "davit"
+
+    def __init__(
+        self,
+        in_chans=3,
+        # num_classes=1000,
+        depths=(1, 1, 9, 1),
+        patch_size=(7, 3, 3, 3),
+        patch_stride=(4, 2, 2, 2),
+        patch_padding=(3, 1, 1, 1),
+        patch_prenorm=(False, True, True, True),
+        embed_dims=(256, 512, 1024, 2048),
+        num_heads=(8, 16, 32, 64),
+        num_groups=(8, 16, 32, 64),
+        window_size=12,
+        mlp_ratio=4.0,
+        qkv_bias=True,
+        drop_path_rate=0.1,
+        norm_layer="layer_norm",
+        enable_checkpoint=False,
+        conv_at_attn=True,
+        conv_at_ffn=True,
+        projection_dim=1024,
+        **kwargs
+    ):
+        super().__init__(**kwargs)
+        self.in_chans = in_chans
+        # self.num_classes = num_classes # Classes remove for AutoModel
+        self.depths = depths
+        self.patch_size = patch_size
+        self.patch_stride = patch_stride
+        self.patch_padding = patch_padding
+        self.patch_prenorm = patch_prenorm
+        self.embed_dims = embed_dims
+        self.num_heads = num_heads
+        self.num_groups = num_groups
+        self.window_size = window_size
+        self.mlp_ratio = mlp_ratio
+        self.qkv_bias = qkv_bias
+        self.drop_path_rate = drop_path_rate
+        self.norm_layer = norm_layer
+        self.enable_checkpoint = enable_checkpoint
+        self.conv_at_attn = conv_at_attn
+        self.conv_at_ffn = conv_at_ffn
+        self.projection_dim = projection_dim

model.safetensors

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+version https://git-lfs.github.com/spec/v1
+oid sha256:16681ba87304886ec1ddac2a7bf40f127352bf5470fcc654da2199bc6776a775
+size 721311024

modeling_davit.py

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+# coding=utf-8
+# Copyright 2024 Microsoft and the HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+""" PyTorch DaViT model."""
+
+
+import math
+import torch
+import torch.utils.checkpoint
+from torch import nn
+import torch.nn.functional as F
+import torch.utils.checkpoint as checkpoint
+from collections import OrderedDict
+from einops import rearrange
+from timm.models.layers import DropPath, trunc_normal_
+
+from transformers.modeling_utils import PreTrainedModel
+from transformers.utils import logging
+
+# Ensure ConvEmbed, SpatialBlock, ChannelBlock, MySequential, etc., are defined before using them
+from .configuration_davit import DaViTConfig
+
+from transformers import AutoModel, AutoConfig
+
+logger = logging.get_logger(__name__)
+
+
+class LearnedAbsolutePositionEmbedding2D(nn.Module):
+    """
+    This module learns positional embeddings up to a fixed maximum size.
+    """
+
+    def __init__(self, embedding_dim=256, num_pos=50):
+        super().__init__()
+        self.row_embeddings = nn.Embedding(num_pos, embedding_dim // 2)
+        self.column_embeddings = nn.Embedding(
+            num_pos, embedding_dim - (embedding_dim // 2)
+        )
+
+    def forward(self, pixel_values):
+        """
+        pixel_values: (batch_size, height, width, num_channels)
+        returns: (batch_size, height, width, embedding_dim * 2)
+        """
+        if len(pixel_values.shape) != 4:
+            raise ValueError("pixel_values must be a 4D tensor")
+        height, width = pixel_values.shape[1:3]
+        width_values = torch.arange(width, device=pixel_values.device)
+        height_values = torch.arange(height, device=pixel_values.device)
+        x_emb = self.column_embeddings(width_values)
+        y_emb = self.row_embeddings(height_values)
+        # (height, width, embedding_dim * 2)
+        pos = torch.cat(
+            [
+                x_emb.unsqueeze(0).repeat(height, 1, 1),
+                y_emb.unsqueeze(1).repeat(1, width, 1),
+            ],
+            dim=-1,
+        )
+        # (embedding_dim * 2, height, width)
+        pos = pos.permute(2, 0, 1)
+        pos = pos.unsqueeze(0)
+        # (batch_size, embedding_dim * 2, height, width)
+        pos = pos.repeat(pixel_values.shape[0], 1, 1, 1)
+        # (batch_size, height, width, embedding_dim * 2)
+        pos = pos.permute(0, 2, 3, 1)
+        return pos
+
+
+class PositionalEmbeddingCosine1D(nn.Module):
+    """
+    This class implements a very simple positional encoding. It follows closely
+    the encoder from the link below:
+    https://pytorch.org/tutorials/beginner/translation_transformer.html
+
+    Args:
+        embed_dim: The dimension of the embeddings.
+        dropout_prob: The dropout probability.
+        max_seq_len: The maximum length to precompute the positional encodings.
+    """
+
+    def __init__(self, embed_dim: int = 512, max_seq_len: int = 1024) -> None:
+        super(PositionalEmbeddingCosine1D, self).__init__()
+        self.embed_dim = embed_dim
+        self.max_seq_len = max_seq_len
+        # Generate the sinusoidal arrays.
+        factor = math.log(10000)
+        denominator = torch.exp(
+            -factor * torch.arange(0, self.embed_dim, 2) / self.embed_dim
+        )
+        # Matrix where rows correspond to a positional embedding as a function
+        # of the position index (i.e., the row index).
+        frequencies = (
+            torch.arange(0, self.max_seq_len).reshape(self.max_seq_len, 1) * denominator
+        )
+        pos_idx_to_embed = torch.zeros((self.max_seq_len, self.embed_dim))
+        # Populate uneven entries.
+        pos_idx_to_embed[:, 0::2] = torch.sin(frequencies)
+        pos_idx_to_embed[:, 1::2] = torch.cos(frequencies)
+        # Save the positional embeddings in a constant buffer.
+        self.register_buffer("pos_idx_to_embed", pos_idx_to_embed)
+
+    def forward(self, seq_embeds: torch.Tensor) -> torch.Tensor:
+        """
+        Args:
+            seq_embeds: The sequence embeddings in order. Allowed size:
+                1. [T, D], where T is the length of the sequence, and D is the
+                frame embedding dimension.
+                2. [B, T, D], where B is the batch size and T and D are the
+                same as above.
+
+        Returns a tensor of with the same dimensions as the input: i.e.,
+        [1, T, D] or [T, D].
+        """
+        shape_len = len(seq_embeds.shape)
+        assert 2 <= shape_len <= 3
+        len_seq = seq_embeds.size(-2)
+        assert len_seq <= self.max_seq_len
+        pos_embeds = self.pos_idx_to_embed[0 : seq_embeds.size(-2), :]
+        # Adapt pre-computed positional embeddings to the input.
+        if shape_len == 3:
+            pos_embeds = pos_embeds.view((1, pos_embeds.size(0), pos_embeds.size(1)))
+        return pos_embeds
+
+
+class LearnedAbsolutePositionEmbedding1D(nn.Module):
+    """
+    Learnable absolute positional embeddings for 1D sequences.
+
+    Args:
+        embed_dim: The dimension of the embeddings.
+        max_seq_len: The maximum length to precompute the positional encodings.
+    """
+
+    def __init__(self, embedding_dim: int = 512, num_pos: int = 1024) -> None:
+        super(LearnedAbsolutePositionEmbedding1D, self).__init__()
+        self.embeddings = nn.Embedding(num_pos, embedding_dim)
+        self.num_pos = num_pos
+
+    def forward(self, seq_embeds: torch.Tensor) -> torch.Tensor:
+        """
+        Args:
+            seq_embeds: The sequence embeddings in order. Allowed size:
+                1. [T, D], where T is the length of the sequence, and D is the
+                frame embedding dimension.
+                2. [B, T, D], where B is the batch size and T and D are the
+                same as above.
+
+        Returns a tensor of with the same dimensions as the input: i.e.,
+        [1, T, D] or [T, D].
+        """
+        shape_len = len(seq_embeds.shape)
+        assert 2 <= shape_len <= 3
+        len_seq = seq_embeds.size(-2)
+        assert len_seq <= self.num_pos
+        # [T, D]
+        pos_embeds = self.embeddings(torch.arange(len_seq).to(seq_embeds.device))
+        # Adapt pre-computed positional embeddings to the input.
+        if shape_len == 3:
+            pos_embeds = pos_embeds.view((1, pos_embeds.size(0), pos_embeds.size(1)))
+        return pos_embeds
+
+
+class MySequential(nn.Sequential):
+    def forward(self, *inputs):
+        for module in self._modules.values():
+            if type(inputs) == tuple:
+                inputs = module(*inputs)
+            else:
+                inputs = module(inputs)
+        return inputs
+
+
+class PreNorm(nn.Module):
+    def __init__(self, norm, fn, drop_path=None):
+        super().__init__()
+        self.norm = norm
+        self.fn = fn
+        self.drop_path = drop_path
+
+    def forward(self, x, *args, **kwargs):
+        shortcut = x
+        if self.norm != None:
+            x, size = self.fn(self.norm(x), *args, **kwargs)
+        else:
+            x, size = self.fn(x, *args, **kwargs)
+
+        if self.drop_path:
+            x = self.drop_path(x)
+
+        x = shortcut + x
+
+        return x, size
+
+
+class Mlp(nn.Module):
+    def __init__(
+        self,
+        in_features,
+        hidden_features=None,
+        out_features=None,
+        act_layer=nn.GELU,
+    ):
+        super().__init__()
+        out_features = out_features or in_features
+        hidden_features = hidden_features or in_features
+        self.net = nn.Sequential(
+            OrderedDict(
+                [
+                    ("fc1", nn.Linear(in_features, hidden_features)),
+                    ("act", act_layer()),
+                    ("fc2", nn.Linear(hidden_features, out_features)),
+                ]
+            )
+        )
+
+    def forward(self, x, size):
+        return self.net(x), size
+
+
+class DepthWiseConv2d(nn.Module):
+    def __init__(
+        self,
+        dim_in,
+        kernel_size,
+        padding,
+        stride,
+        bias=True,
+    ):
+        super().__init__()
+        self.dw = nn.Conv2d(
+            dim_in,
+            dim_in,
+            kernel_size=kernel_size,
+            padding=padding,
+            groups=dim_in,
+            stride=stride,
+            bias=bias,
+        )
+
+    def forward(self, x, size):
+        B, N, C = x.shape
+        H, W = size
+        assert N == H * W
+
+        x = self.dw(x.transpose(1, 2).view(B, C, H, W))
+        size = (x.size(-2), x.size(-1))
+        x = x.flatten(2).transpose(1, 2)
+        return x, size
+
+
+class ConvEmbed(nn.Module):
+    """Image to Patch Embedding"""
+
+    def __init__(
+        self,
+        patch_size=7,
+        in_chans=3,
+        embed_dim=64,
+        stride=4,
+        padding=2,
+        norm_layer=None,
+        pre_norm=True,
+    ):
+        super().__init__()
+        self.patch_size = patch_size
+
+        self.proj = nn.Conv2d(
+            in_chans, embed_dim, kernel_size=patch_size, stride=stride, padding=padding
+        )
+
+        dim_norm = in_chans if pre_norm else embed_dim
+        self.norm = norm_layer(dim_norm) if norm_layer else None
+
+        self.pre_norm = pre_norm
+
+    def forward(self, x, size):
+        H, W = size
+        if len(x.size()) == 3:
+            if self.norm and self.pre_norm:
+                x = self.norm(x)
+            x = rearrange(x, "b (h w) c -> b c h w", h=H, w=W)
+
+        x = self.proj(x)
+
+        _, _, H, W = x.shape
+        x = rearrange(x, "b c h w -> b (h w) c")
+        if self.norm and not self.pre_norm:
+            x = self.norm(x)
+
+        return x, (H, W)
+
+
+class ChannelAttention(nn.Module):
+
+    def __init__(self, dim, groups=8, qkv_bias=True):
+        super().__init__()
+
+        self.groups = groups
+        self.qkv = nn.Linear(dim, dim * 3, bias=qkv_bias)
+        self.proj = nn.Linear(dim, dim)
+
+    def forward(self, x, size):
+        B, N, C = x.shape
+
+        qkv = (
+            self.qkv(x)
+            .reshape(B, N, 3, self.groups, C // self.groups)
+            .permute(2, 0, 3, 1, 4)
+        )
+        q, k, v = qkv[0], qkv[1], qkv[2]
+
+        q = q * (float(N) ** -0.5)
+        attention = q.transpose(-1, -2) @ k
+        attention = attention.softmax(dim=-1)
+        x = (attention @ v.transpose(-1, -2)).transpose(-1, -2)
+        x = x.transpose(1, 2).reshape(B, N, C)
+        x = self.proj(x)
+        return x, size
+
+
+class ChannelBlock(nn.Module):
+
+    def __init__(
+        self,
+        dim,
+        groups,
+        mlp_ratio=4.0,
+        qkv_bias=True,
+        drop_path_rate=0.0,
+        act_layer=nn.GELU,
+        norm_layer=nn.LayerNorm,
+        conv_at_attn=True,
+        conv_at_ffn=True,
+    ):
+        super().__init__()
+
+        drop_path = DropPath(drop_path_rate) if drop_path_rate > 0.0 else nn.Identity()
+
+        self.conv1 = (
+            PreNorm(None, DepthWiseConv2d(dim, 3, 1, 1)) if conv_at_attn else None
+        )
+        self.channel_attn = PreNorm(
+            norm_layer(dim),
+            ChannelAttention(dim, groups=groups, qkv_bias=qkv_bias),
+            drop_path,
+        )
+        self.conv2 = (
+            PreNorm(None, DepthWiseConv2d(dim, 3, 1, 1)) if conv_at_ffn else None
+        )
+        self.ffn = PreNorm(
+            norm_layer(dim),
+            Mlp(
+                in_features=dim,
+                hidden_features=int(dim * mlp_ratio),
+                act_layer=act_layer,
+            ),
+            drop_path,
+        )
+
+    def forward(self, x, size):
+        if self.conv1:
+            x, size = self.conv1(x, size)
+        x, size = self.channel_attn(x, size)
+
+        if self.conv2:
+            x, size = self.conv2(x, size)
+        x, size = self.ffn(x, size)
+
+        return x, size
+
+
+def window_partition(x, window_size: int):
+    B, H, W, C = x.shape
+    x = x.view(B, H // window_size, window_size, W // window_size, window_size, C)
+    windows = (
+        x.permute(0, 1, 3, 2, 4, 5).contiguous().view(-1, window_size, window_size, C)
+    )
+    return windows
+
+
+def window_reverse(windows, batch_size: int, window_size: int, H: int, W: int):
+    B = batch_size
+    # this will cause onnx conversion failed for dynamic axis, because treated as constant
+    # int(windows.shape[0] / (H * W / window_size / window_size))
+    x = windows.view(
+        B, H // window_size, W // window_size, window_size, window_size, -1
+    )
+    x = x.permute(0, 1, 3, 2, 4, 5).contiguous().view(B, H, W, -1)
+    return x
+
+
+class WindowAttention(nn.Module):
+    def __init__(self, dim, num_heads, window_size, qkv_bias=True):
+
+        super().__init__()
+        self.dim = dim
+        self.window_size = window_size
+        self.num_heads = num_heads
+        head_dim = dim // num_heads
+        self.scale = float(head_dim) ** -0.5
+
+        self.qkv = nn.Linear(dim, dim * 3, bias=qkv_bias)
+        self.proj = nn.Linear(dim, dim)
+
+        self.softmax = nn.Softmax(dim=-1)
+
+    def forward(self, x, size):
+
+        H, W = size
+        B, L, C = x.shape
+        assert L == H * W, "input feature has wrong size"
+
+        x = x.view(B, H, W, C)
+
+        pad_l = pad_t = 0
+        pad_r = (self.window_size - W % self.window_size) % self.window_size
+        pad_b = (self.window_size - H % self.window_size) % self.window_size
+        x = F.pad(x, (0, 0, pad_l, pad_r, pad_t, pad_b))
+        _, Hp, Wp, _ = x.shape
+
+        x = window_partition(x, self.window_size)
+        x = x.view(-1, self.window_size * self.window_size, C)
+
+        # W-MSA/SW-MSA
+        # attn_windows = self.attn(x_windows)
+
+        B_, N, C = x.shape
+        qkv = (
+            self.qkv(x)
+            .reshape(B_, N, 3, self.num_heads, C // self.num_heads)
+            .permute(2, 0, 3, 1, 4)
+        )
+        q, k, v = qkv[0], qkv[1], qkv[2]
+
+        q = q * self.scale
+        attn = q @ k.transpose(-2, -1)
+        attn = self.softmax(attn)
+
+        x = (attn @ v).transpose(1, 2).reshape(B_, N, C)
+        x = self.proj(x)
+
+        # merge windows
+        x = x.view(-1, self.window_size, self.window_size, C)
+        x = window_reverse(x, B, self.window_size, Hp, Wp)
+
+        if pad_r > 0 or pad_b > 0:
+            x = x[:, :H, :W, :].contiguous()
+
+        x = x.view(B, H * W, C)
+
+        return x, size
+
+
+class SpatialBlock(nn.Module):
+
+    def __init__(
+        self,
+        dim,
+        num_heads,
+        window_size,
+        mlp_ratio=4.0,
+        qkv_bias=True,
+        drop_path_rate=0.0,
+        act_layer=nn.GELU,
+        norm_layer=nn.LayerNorm,
+        conv_at_attn=True,
+        conv_at_ffn=True,
+    ):
+        super().__init__()
+
+        drop_path = DropPath(drop_path_rate) if drop_path_rate > 0.0 else nn.Identity()
+
+        self.conv1 = (
+            PreNorm(None, DepthWiseConv2d(dim, 3, 1, 1)) if conv_at_attn else None
+        )
+        self.window_attn = PreNorm(
+            norm_layer(dim),
+            WindowAttention(dim, num_heads, window_size, qkv_bias=qkv_bias),
+            drop_path,
+        )
+        self.conv2 = (
+            PreNorm(None, DepthWiseConv2d(dim, 3, 1, 1)) if conv_at_ffn else None
+        )
+        self.ffn = PreNorm(
+            norm_layer(dim),
+            Mlp(
+                in_features=dim,
+                hidden_features=int(dim * mlp_ratio),
+                act_layer=act_layer,
+            ),
+            drop_path,
+        )
+
+    def forward(self, x, size):
+        if self.conv1:
+            x, size = self.conv1(x, size)
+        x, size = self.window_attn(x, size)
+
+        if self.conv2:
+            x, size = self.conv2(x, size)
+        x, size = self.ffn(x, size)
+        return x, size
+
+
+# Define DaViT model class
+class DaViTModel(PreTrainedModel):
+    config_class = DaViTConfig
+
+    def __init__(self, config: DaViTConfig):
+        super().__init__(config)
+
+        # self.num_classes = config.num_classes
+        self.embed_dims = config.embed_dims
+        self.num_heads = config.num_heads
+        self.num_groups = config.num_groups
+        self.num_stages = len(self.embed_dims)
+        self.enable_checkpoint = config.enable_checkpoint
+        assert self.num_stages == len(self.num_heads) == len(self.num_groups)
+
+        num_stages = len(config.embed_dims)
+        dpr = [
+            x.item()
+            for x in torch.linspace(0, config.drop_path_rate, sum(config.depths) * 2)
+        ]
+
+        depth_offset = 0
+        convs = []
+        blocks = []
+        for i in range(num_stages):
+            conv_embed = ConvEmbed(
+                patch_size=config.patch_size[i],
+                stride=config.patch_stride[i],
+                padding=config.patch_padding[i],
+                in_chans=config.in_chans if i == 0 else self.embed_dims[i - 1],
+                embed_dim=self.embed_dims[i],
+                norm_layer=(
+                    nn.LayerNorm
+                    if config.norm_layer == "layer_norm"
+                    else nn.BatchNorm2d
+                ),
+                pre_norm=config.patch_prenorm[i],
+            )
+            convs.append(conv_embed)
+
+            block = MySequential(
+                *[
+                    MySequential(
+                        OrderedDict(
+                            [
+                                (
+                                    "spatial_block",
+                                    SpatialBlock(
+                                        self.embed_dims[i],
+                                        self.num_heads[i],
+                                        config.window_size,
+                                        drop_path_rate=dpr[depth_offset + j * 2],
+                                        qkv_bias=config.qkv_bias,
+                                        mlp_ratio=config.mlp_ratio,
+                                        conv_at_attn=config.conv_at_attn,
+                                        conv_at_ffn=config.conv_at_ffn,
+                                    ),
+                                ),
+                                (
+                                    "channel_block",
+                                    ChannelBlock(
+                                        self.embed_dims[i],
+                                        self.num_groups[i],
+                                        drop_path_rate=dpr[depth_offset + j * 2 + 1],
+                                        qkv_bias=config.qkv_bias,
+                                        mlp_ratio=config.mlp_ratio,
+                                        conv_at_attn=config.conv_at_attn,
+                                        conv_at_ffn=config.conv_at_ffn,
+                                    ),
+                                ),
+                            ]
+                        )
+                    )
+                    for j in range(config.depths[i])
+                ]
+            )
+            blocks.append(block)
+            depth_offset += config.depths[i] * 2
+
+        self.convs = nn.ModuleList(convs)
+        self.blocks = nn.ModuleList(blocks)
+
+        # self.norms = (
+        #     nn.LayerNorm(self.embed_dims[-1])
+        #     if config.norm_layer == "layer_norm"
+        #     else nn.BatchNorm2d(self.embed_dims[-1])
+        # )
+        self.avgpool = nn.AdaptiveAvgPool1d(1)
+        # self.head = (
+        #     nn.Linear(self.embed_dims[-1], self.num_classes)
+        #     if self.num_classes > 0
+        #     else nn.Identity()
+        # )
+
+        self.apply(self._init_weights)
+
+    def _init_weights(self, m):
+        if isinstance(m, nn.Linear):
+            trunc_normal_(m.weight, std=0.02)
+            if m.bias is not None:
+                nn.init.constant_(m.bias, 0)
+        elif isinstance(m, nn.Conv2d):
+            nn.init.normal_(m.weight, std=0.02)
+            for name, _ in m.named_parameters():
+                if name in ["bias"]:
+                    nn.init.constant_(m.bias, 0)
+        elif isinstance(m, nn.LayerNorm):
+            nn.init.constant_(m.weight, 1.0)
+            nn.init.constant_(m.bias, 0)
+        elif isinstance(m, nn.BatchNorm2d):
+            nn.init.constant_(m.weight, 1.0)
+            nn.init.constant_(m.bias, 0)
+
+    def forward_features_unpool(self, x):
+        """
+        forward until avg pooling
+        Args:
+            x (_type_): input image tensor
+        """
+        input_size = (x.size(2), x.size(3))
+        for conv, block in zip(self.convs, self.blocks):
+            x, input_size = conv(x, input_size)
+            if self.enable_checkpoint:
+                x, input_size = checkpoint.checkpoint(block, x, input_size)
+            else:
+                x, input_size = block(x, input_size)
+        return x
+
+    def forward_features(self, x):
+        x = self.forward_features_unpool(x)
+
+        # (batch_size, num_tokens, token_dim)
+        x = self.avgpool(x.transpose(1, 2))
+        # (batch_size, 1, num_tokens)
+        x = torch.flatten(x, 1)
+        # x = self.norms(x)
+
+        return x
+
+    def forward(self, x):
+        x = self.forward_features(x)
+        # x = self.head(x)
+        return x
+
+
+# Register the configuration and model
+AutoConfig.register("davit", DaViTConfig)
+AutoModel.register(DaViTConfig, DaViTModel)